Smirking Spelljacker 

Creature — Djinn Wizard Rogue
Flash
Flying
When this creature enters, exile target spell an opponent controls.
Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost.
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Mirror-Style Master 90%
$0.27#12093
"Whenever this creature attacks, for each attacking modified creature you control, create a tapped and attacking token that's a copy of that creature. Exile those tokens at end of combat."
Yuan Shao's Infantry 90%
$5.31#31156
"Whenever this creature attacks alone, this creature can't be blocked this combat."
Hardened Berserker 89%
$0.03#23580
"Whenever this creature attacks, the next spell you cast this turn costs {1} less to cast."
Ogre Marauder 89%
$0.25#24804
"Whenever this creature attacks, it gains "this creature can't be blocked" until end of turn unless defending player sacrifices a creature of their choice."
Mardu Siegebreaker 88%
$0.46#3889
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
+1 more matching line
Xantid Swarm 88%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Phantom Steed 87%
$0.44#11066
"Whenever this creature attacks, create a tapped and attacking token that's a copy of the exiled card, except it's an Illusion in addition to its other types. Sacrifice that token at end of combat."
+2 more matching lines
Goblin Maskmaker 87%
$0.11#21018
"Whenever this creature attacks, face-down spells you cast this turn cost {1} less to cast."
Abyssal Nightstalker 86%
$0.50#27330
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Sunfrill Imitator 86%
$0.80#3713
"Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is this card and it has this ability."
Hobgoblin Captain 86%
$0.13#19164
"Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, this creature gains first strike until end of turn."
Burning-Tree Vandal 86%
$0.19#21076
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Null Group Biological Assets 86%
$0.08#25398
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Vaultbreaker 86%
$0.05#24386
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Goliath Daydreamer 86%
$0.30#10121
"Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost."
Flockchaser Phantom 86%
$0.28#13180
"Whenever this creature attacks, the next spell you cast this turn has convoke."
Bull-Rush Bruiser 86%
$0.09#25726
"Whenever this creature attacks, if your team controls another Warrior, this creature gains first strike until end of turn."
Stromgald Spy 86%
$0.15#29721
"Whenever this creature attacks and isn't blocked, you may have defending player play with their hand revealed for as long as this creature remains on the battlefield. If you do, this creature assigns no combat damage this turn."
Flamerush Rider 85%
$0.17#4715
"Whenever this creature attacks, create a token that's a copy of another target attacking creature and that's tapped and attacking. Exile the token at end of combat."